由低核度集群和单核站点的协同作用引起的电子结构调制,用于高效的氧气电催化
Zhijun Li1, Hongxue Liu1, Yu-Hao Wang2
1State Key Laboratory of Continental Shale Oil, Joint International Research Laboratory of Advanced Chemical Catalytic Materials & Surface Science, College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, PR China.
ACS nano
|December 27, 2024
概括
我们开发了一种新的双功能催化剂,使用单个原子和添加碳的集群来改善氧反应. 这种催化剂显著提高了空气电池的性能和寿命.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 轻微的氧减少和演化反应 (ORR和OER) 阻碍了高性能双功能电催化剂的开发.
- 空气电池需要高效的催化剂,用于氧气反应,以改善储能应用.
研究的目的:
- 设计和合成一种新的双功能电催化剂,克服ORR和OER的局限性.
- 研究单个原子和集群对增强催化活性的协同效应.
主要方法:
- 一种催化剂的制造,该催化剂由含有低核度 Co 集群和相邻的 Co 单个原子组成,在添加碳基质上 (CoSA+C/NC).
- 电化学表征包括半波电位 (E1/2) 和超电位 (η) 测量.
- 使用开发的催化剂组装和测试一个空气电池.
- 理论分析以了解电子相互作用和催化机制.
主要成果:
- CoSA+C/NC催化剂表现出异常的ORR/OER活性,E1/2为0.91V,η为340mV在10mA cm-2时.
- 使用CoSA+C/NC的空气电池实现了高功率密度 (284.1mW cm-2) 和长寿命 (400小时).
- 证实了Co集群和单个Co原子之间的协同电子相互作用可以增强双功能活动.
结论:
- 精确定制的电子结构和物种之间的协同效应对于先进的电催化剂设计至关重要.
- 与基准相比,CoSA+C/NC催化剂为空气电池提供了卓越的性能.
- 本研究提供了用于能源应用的具有强烈电子相互作用的多相金属电催化剂的设计原理.
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